1 /*
2 * Copyright (C) 2011 Dan Carpenter.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 */
17
18 #include "smatch.h"
19
20 static int my_id;
21
check_size_not_zero(struct expression * expr)22 static void check_size_not_zero(struct expression *expr)
23 {
24 sval_t sval;
25
26 if (expr->type != EXPR_VALUE)
27 return;
28 if (!get_value(expr, &sval))
29 return;
30 if (sval.value != 0)
31 return;
32 sm_error("calling memset(x, y, 0);");
33 }
34
check_size_not_ARRAY_SIZE(struct expression * expr)35 static void check_size_not_ARRAY_SIZE(struct expression *expr)
36 {
37 char *name;
38
39 name = get_macro_name(expr->pos);
40 if (name && strcmp(name, "ARRAY_SIZE") == 0)
41 sm_warning("calling memset(x, y, ARRAY_SIZE());");
42 }
43
match_memset(const char * fn,struct expression * expr,void * data)44 static void match_memset(const char *fn, struct expression *expr, void *data)
45 {
46 struct expression *arg_expr;
47
48 arg_expr = get_argument_from_call_expr(expr->args, 2);
49 if (!arg_expr)
50 return;
51 check_size_not_zero(arg_expr);
52 check_size_not_ARRAY_SIZE(arg_expr);
53 }
54
check_memset(int id)55 void check_memset(int id)
56 {
57 my_id = id;
58 add_function_hook("memset", &match_memset, NULL);
59 add_function_hook("__builtin_memset", &match_memset, NULL);
60 }
61